She can dismiss the Nine without struggle.

Isn't that a Hobbit trilogy thing and not represented in any actual writings?

e: In Tolkien's writings strength is usually spiritual strength. The Witch-king was imbued with additional physical strength at the Battle of the Pelennor Fields but normally the wraiths are no physically stronger than men. Their power is in the fear they create which Galadriel would be immune to, and they would likely fear her as they feared Glorfindel. So if they nutted up and attacked her they would win easily but that would be like a group of men nutting up and fighting a ringwraith; they would win but it's unlikely that they would ever try.

She can dismiss the Nine without struggle.

Isn't that a Hobbit trilogy thing and not represented in any actual writings?